Double-silencing structure, front and back

The FBD series features a low-noise, front-and-back dual-silencing structure. Building upon the standard design of the FBD series explosion-proof, pressurized, counter-rotating axial-flow local ventilators for mining applications, this model incorporates an imported silencer to achieve a dual-silencing configuration at both the inlet and outlet. The fan consists of a flow collector, an inlet silencer, a primary-stage main unit, a secondary-stage main unit, an outlet silencer diffuser, and an explosion-proof motor. This ventilator boasts characteristics of high airflow, high static pressure, high efficiency, and low noise. With its sophisticated design and advanced manufacturing processes, it offers advantages such as energy savings, low noise levels, modularity, simple structure, and ease of maintenance and repair, making it highly versatile and suitable for a wide range of applications.

Environmentally friendly, convenient, detachable, low-noise axial-flow local ventilation fan structure

Considering the environmentally friendly FBD low-noise axial-flow local ventilator, which operates for extended periods in environments with high concentrations of coal dust or airborne particulates, the internal sound-absorbing layers tend to accumulate significant amounts of dust or coal ash over time. A large buildup of dust or coal ash adhering to the sound-absorbing materials can severely degrade the noise-reduction performance. Moreover, removing this accumulated debris from the original structure proves extremely challenging. Therefore, our company has developed a new, convenient, and easily disassembled hexagonal design for the environmentally friendly FBD low-noise axial-flow local ventilator.

This structure features a three-dimensional hexagonal design and employs an automated edge-folding process along with an independently developed design approach, making it convenient and easy for users to replace the sound-absorbing materials later on. The structure is simple to disassemble and easy to install, effectively meeting users’ noise reduction requirements for fans while also addressing the issue of subsequent contamination, cleaning, and replacement of noise-reducing materials. It’s both practical and cost-effective.

Structure of Environmentally Friendly, Low-Noise Local Ventilator

The environmentally friendly FBD explosion-proof axial-flow local ventilator for mining reduces noise at various frequencies to below 85 to 80 decibels, protecting workers' physical and mental health, improving the underground working environment, and achieving environmentally friendly ventilation in mines.

The environmentally friendly local exhaust fan is a new product developed on the basis of the side-inlet, low-noise local exhaust fan. Its noise level is below 80 decibels. The noise-reduction measures adopted in this low-noise, environmentally friendly local exhaust fan are designed according to the principles of noise generation and propagation: by altering the air intake direction and optimizing the structural design, the fan effectively absorbs mid- and low-frequency noise and efficiently isolates high-frequency noise, thereby eliminating and reducing the overall noise level. Featuring a modular design composed of various sound-absorbing components, this fan offers users enhanced flexibility in selection, retrofitting, and customization options.

Environmentally friendly FBD low-noise axial local ventilator

Local ventilation fans for coal mines are essential ventilation equipment used in the mining and excavation processes. In particular, the FBD series of explosion-proof, positive-pressure, counter-rotating axial-flow local ventilation fans are widely employed not only for long-distance, positive-pressure ventilation in large- and small-section roadways within coal mines but also for ventilation and air exchange in industrial sectors such as metallurgy, petrochemicals, power generation, railways, and highway tunnels. This series of ventilation fans is specifically designed to match the ventilation parameters of coal mine roadways, making them ideal for tunneling operations. These fans feature high airflow, high static pressure, and high efficiency. However, during operation, they generate harsh aerodynamic and mechanical noise, which has already begun to affect the physical and mental health of workers in mine production environments. Currently, most commonly used local ventilation fans employ a double-shell design filled with sound-absorbing materials to reduce noise levels. Nevertheless, the overall radiated noise from these operating fans still exceeds 100 dB(A), failing to meet customers’ requirements for low noise levels.

To this end, our company has developed environmentally friendly ventilators featuring low-noise and ultra-low-noise performance, reducing the noise levels of various frequencies emitted by the fans to below 85 to 80 decibels. This protects the physical and mental health of on-site workers, improves the working environment underground in mines, and achieves environmentally friendly ventilation. We have adopted multi-faceted noise reduction measures. Based on the aerodynamic principles of fans as well as the mechanisms behind noise generation and propagation, we have added streamlined intake silencers and composite inlet-outlet silencer tubes. Furthermore, we have optimized the structural design of the fan’s main body and enhanced the absorption of mid- and low-frequency noise by incorporating high-quality sound-absorbing materials, while efficiently isolating high-frequency noise. As a result, the overall noise level of the fan has been effectively eliminated and significantly reduced.

Introduction to the Patent for a Low-Noise Counter-rotating Axial Flow Fan

FBD Series Mine-Explosion-Proof Pressurized Counter-Rotating Axial Flow Local Ventilator

Local ventilation systems for coal mines are essential ventilation equipment used during the mining and excavation process. In particular, the EBD series of mine-use local exhaust-type positive-pressure axial-flow fans—both forward-curved and backward-curved—are widely employed not only for positive-pressure long-distance ventilation in large- and small-section roadways underground in coal mines but also for ventilation and air exchange in industrial sectors such as metallurgy, petrochemicals, power generation, railways, and highway tunnels. This series of fans is specifically designed to match the ventilation parameters of coal mine roadways and is ideal for use in tunneling operations. These fans feature high airflow, high static pressure, and high efficiency.

The side-inlet silencer, combined with inlet and outlet silencers, significantly reduces wind noise. Moreover, the silencer material—oil-immersed glass fiber felt—features antistatic and flame-retardant properties. Starting from the design stage, the fan incorporates measures in three key areas—air dynamic stability for noise reduction, electrical circuit noise suppression for the motor, and structural vibration damping for the machine core—to effectively minimize operational noise. The noise level complies with JB/T 8690-2014, "Noise Limits for Industrial Ventilation Fans."

Shanxi Jin Yun’an Fan Co., Ltd. (formerly Shanxi Yun’an Fan Manufacturing Co., Ltd.) is located in the Yuncheng Economic and Technological Development Zone. The company was established in 2013 with a registered capital of 50 million yuan and covers an area of 46,000 square meters. Its fixed assets exceed 36 million yuan, and it currently employs over 120 people, including 20 engineering and technical personnel. The company has long-term collaborative relationships with research institutions such as Northwestern Polytechnical University, Taiyuan University of Technology, and China University of Mining and Technology, engaging in technological R&D. It also recruits experts and professors as R&D consultants to stay abreast of industry development trends and continuously strengthen its technological innovation. The company is equipped with complete production and testing facilities, featuring more than 180 advanced processing and manufacturing devices, including laser cutting machines, automatic welding equipment, CNC bending machines, shearing machines, plate rolling machines, CNC lathes, dynamic balancing machines, and fan performance testing laboratories. It is a specialized fan manufacturer integrating R&D, production, sales, and after-sales service.

The company’s core business focuses on the design, R&D, and manufacturing of various ventilation fans and their complementary products for mines, non-coal mines, rail transit systems, and other sectors. Its product portfolio includes 38 fan series—such as the FB(D) series, FBC(D)Z series, FKZ series, rail transit SDS series, and tunnel SDF series—comprising more than 3,000 different specifications. Complementary products include self-resetting explosion-proof doors for vertical and inclined shafts, louver-type automatic regulating dampers, side-opening (vertical) automatic regulating dampers, butterfly valves, silencers, online monitoring and fault diagnosis systems for main ventilation fans, wind-reversing systems that allow continuous operation without stopping airflow, and intelligent lubrication systems. These products comprehensively meet the ventilation needs of mines and are widely exported to various sectors across China. as well as international markets such as South Africa, Russia, and Southeast Asia 。

In recent years, the company has successively been awarded honors such as “Yuncheng Enterprise Technology Center,” “Outstanding Enterprise of Yuncheng,” “Demonstration Enterprise for Intellectual Property in Yuncheng,” and “Innovative Small and Medium-sized Enterprise.” The company has obtained certifications including “ISO9001 Quality Management System Certification,” “ISO14001 Environmental Management System Certification,” and “ISO45001 Occupational Health and Safety Management System Certification.” Its products have also passed the “China National Compulsory Product Certification,” and the company holds numerous patents. Relying on advanced process equipment, strong technical capabilities, excellent product quality, and a comprehensive service system, the company has earned unanimous recognition and praise from a wide range of customers. In particular, in recent years, the company has focused on launching environmentally friendly, low-noise fans into the market, achieving rapid growth and becoming a well-known enterprise that leads the industry in fan technology.

Where there’s sincerity, even metal and stone can be moved. Adhering to the principle of “people-oriented and technology-driven enterprise development” and the belief that “innovation paves the way to the future,” Jin Yun’an Company, backed by its robust technological capabilities, advanced CNC precision machining equipment, an outstanding team of talented professionals, and cutting-edge management practices, remains committed—as always—to providing customers with high-quality mining ventilation equipment and making greater contributions to the safe production and sustainable development of China’s mining industry.